> What are the practical applications of recursion though ? Traversing and transforming nested data structures. Just last month I had to write code that maps

> What are the practical applications of recursion though ? Traversing and transforming nested data structures. Just last month I had to write code that maps flat data from one system into a nested structure required by another system. We wrote mappings as map literals and the code traverses them creating a new instance of the map filling the leaves with data from the input row and running some business logic on it.